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Harmony

Introduction

Harmony is an open and fast blockchain. The production mainnet supports 4 shards of 1000 nodes, capable of running Ethereum applications with 2-second transaction finality, and 1000 times lower fees than Ethereum.

Harmony is your open platform for assets, collectibles, identity, governance. The secure bridges offer cross-chain asset transfers with Ethereum, Binance and 3 other chains.

Harmony’s Effective Proof-of-Stake (EPoS) reduces centralization while supporting stake delegation, reward compounding and double-sign slashing.

Harmony aims to build an open network of nodes operated and governed by a large community. This node community is called Pangaea.

Quick facts

Property Value
Harmony Mainnet (Shard 0) chainId 1666600000
Harmony Blockchain Explorer https://explorer.harmony.one/
Block time ~2 seconds

Supported endpoints

Get token balances for address
Class A
Given chain_id and wallet address, return current token balances along with their spot prices. This endpoint supports a variety of token standards like ERC20, ERC721 and ERC1155. As a special case, network native tokens like ETH on Ethereum are also returned even though it’s not a token contract.
GET
/v1/:chain_id/address/:address/balances_v2/
Get transactions for address
Class A
Given chain_id and wallet address, return all transactions along with their decoded log events. This endpoint does a deep-crawl of the blockchain to retrieve all kinds of transactions that references the address including indexed topics within the event logs.
GET
/v1/:chain_id/address/:address/transactions_v2/
Get ERC20 token transfers for address
Class A
Given chain_id, wallet address and contract-address, return all ERC20 token contract transfers along with their historical prices at the time of their transfer.
GET
/v1/:chain_id/address/:address/transfers_v2/
Get token holders as of any block height
Class A
Given chain_id and wallet address, return a paginated list of token holders. If block-height is omitted, the latest block is used.
GET
/v1/:chain_id/tokens/:address/token_holders/
Get log events by contract address
Class A
Given chain_id and contract address, return a paginated list of decoded log events emitted by a particular smart contract.
GET
/v1/:chain_id/events/address/:address/
Get log events by topic hash(es)
Class A
Given chain_id and topic hash(es), return a paginated list of decoded log events with one or more topic hashes separated by a comma.
GET
/v1/:chain_id/events/topics/:topic/

Go to Covalent’s API Reference

Last modified: October 5, 2022: september-changelog-2022 (#237) (7fb89f6)